29-03-2011, 09:17 AM
Our topic for the seminar in FSO ie Free Space Optics. This is a new technology that is expanding in recent times in the field of digital communication.
Under this Topic we shall take you through the following sections
• Intro to optical comm. their advantages & disadvantages
• Intro to FSO
• Relevance of FSO in present day communication
• Origin of FSO
• The technology of FSO
• Working of FSO system
• Application of FSO
• Merits and demerits of FSO
• FSO ! As a future technology
Communication as we all know is a process of sending information from source to sink via a channel. Optical comm. Uses optical fibre made of glass as the comm. channel. Optical fiber works on the principle of total internal reflection..
The transmitters in optical fiber links are generally light-emitting diodes (LEDs) or laser diodes. Infrared light, rather than visible light is used more commonly, because optical fibers transmit infrared wavelengths with less attenuation and dispersion. They find wide application in Telephone system, cable TV system, and also internet fiber optic lines along with commercial application.
Their Advantages over electrical comm. May include:
• Higher bandwidth (extremely high data transfer rate).
• Less signal degradation.
• Optical fibers are resistive to corrosion
• Lighter and thinner then copper wire.
• Immunity to tapping information
• Immunity to cross talk
• High information carrying capacity
Disadvantages are:
• High investment cost
• Need for more expensive optical transmitters and receivers
• More difficult and expensive to splice than wires
• At higher optical powers, is susceptible to "fiber fuse"
• Affected by chemicals - The glass can be affected by various chemicals including hydrogen gas (a problem in underwater cables.)
• Less flexible
• Point to point comm
Therefore we opt for a better solution ie FSO “The Technology at the Heart of Optical Wireless”
Free Space Optics communications, also called Free Space Photonics (FSP) or Optical Wireless, refers to the transmission of visible and infrared (IR) beams through the atmosphere to obtain optical communications. Like fiber, Free Space Optics uses lasers to
transmit data, but instead of enclosing the data stream in a glass fiber, it is transmitted through the air.
• FSO is a line-of-sight technology in which fiber is replaced by free space
• FSO can transmit data, voice or video with speed capable of reaching 2.5Gbytes which is far superior to fiber comm.
• It is bidirectional or full duplex comm. In which info can pass from both as well as sink
• FSO systems use invisible infrared laser light wavelengths in the 750nm to 1550nm range.
• These systems are compatible with a wide range of applications and markets, and they are sufficiently flexible as to be easily implemented using a variety of different architectures.
Under this Topic we shall take you through the following sections
• Intro to optical comm. their advantages & disadvantages
• Intro to FSO
• Relevance of FSO in present day communication
• Origin of FSO
• The technology of FSO
• Working of FSO system
• Application of FSO
• Merits and demerits of FSO
• FSO ! As a future technology
Communication as we all know is a process of sending information from source to sink via a channel. Optical comm. Uses optical fibre made of glass as the comm. channel. Optical fiber works on the principle of total internal reflection..
The transmitters in optical fiber links are generally light-emitting diodes (LEDs) or laser diodes. Infrared light, rather than visible light is used more commonly, because optical fibers transmit infrared wavelengths with less attenuation and dispersion. They find wide application in Telephone system, cable TV system, and also internet fiber optic lines along with commercial application.
Their Advantages over electrical comm. May include:
• Higher bandwidth (extremely high data transfer rate).
• Less signal degradation.
• Optical fibers are resistive to corrosion
• Lighter and thinner then copper wire.
• Immunity to tapping information
• Immunity to cross talk
• High information carrying capacity
Disadvantages are:
• High investment cost
• Need for more expensive optical transmitters and receivers
• More difficult and expensive to splice than wires
• At higher optical powers, is susceptible to "fiber fuse"
• Affected by chemicals - The glass can be affected by various chemicals including hydrogen gas (a problem in underwater cables.)
• Less flexible
• Point to point comm
Therefore we opt for a better solution ie FSO “The Technology at the Heart of Optical Wireless”
Free Space Optics communications, also called Free Space Photonics (FSP) or Optical Wireless, refers to the transmission of visible and infrared (IR) beams through the atmosphere to obtain optical communications. Like fiber, Free Space Optics uses lasers to
transmit data, but instead of enclosing the data stream in a glass fiber, it is transmitted through the air.
• FSO is a line-of-sight technology in which fiber is replaced by free space
• FSO can transmit data, voice or video with speed capable of reaching 2.5Gbytes which is far superior to fiber comm.
• It is bidirectional or full duplex comm. In which info can pass from both as well as sink
• FSO systems use invisible infrared laser light wavelengths in the 750nm to 1550nm range.
• These systems are compatible with a wide range of applications and markets, and they are sufficiently flexible as to be easily implemented using a variety of different architectures.
